Edwards TCU 40/80

7.8 Annual preventative maintenance
Refer to the Troubleshooting section on page 42 when results for any of the following check points are
not as expected.
7.8.1 Required equipment
12" slotted screwdriver
4" slotted screwdriver
7" slotted screwdriver
8" phillips screwdriver
Two 10" adjustable wrenches
Wire strippers (14 AWG)
Two test clips w/12" leads
Miniature diagonal cutters
Halogen leak detector
3\8" open-ended wrench
1\4" open-ended wrench
Wire crimpers - Insulated terminal
Digital multimeter (DMM)
Remote RTD connector plug (J72J3)
7.8.2 Required supplies
• Preventative Maintenance Kit (P60153005)
• Fluorinert
• Insulation Tape
7.8.3 Solenoid valve coil replacement
Electric Shock
Ensure all electrical power has been removed and
the main circuit breaker has been turned off due to
the presence of high voltage or current.
Caution
Should a solenoid valve coil require replacement,
notify the appropriate personnel that an EMO
condition will occur.
Failure to follow these instructions may result in
the shut-down of the process tool and associated
equipment.
30
1. Press STOP.. Turn off the main circuit breaker (CB1).
2. Disconnect the power cord from the mains power supply.
3. Locate the main cooling solenoid valve (SV1) from the left side access door.
4. Remove the junction box attachment screw. Slide off the junction box cover.
5. Back off the strain relief retaining nut.
6. Unfasten the ground screw. Cut off the wire butt splices (ensuring that the wire labels remain
attached to the base assembly) and pull the wires through the junction box.
7. Remove the solenoid valve coil lock nut. Lift off the spacer cup. Separate the coil from the solenoid
valve body by gently pulling up on the coil.
8. Remove replacement solenoid valve coil from packaging.
9. Remove the junction box.
10. Note the location of the conduit hole on the coil removed and remove the appropriate "knock-out" on
the replacement coil.
TCU 40/80 Temperature Control Unit